client_{,r}cycle() doens't need a client. so get rid of KBFUNC_NEEDSCLIENT.

this prevents the issue where you close or hide a window, and end up
with no client selected (you're on the root window). When that happened
alt-tab failed.  This, however, exposed to me a few more issues in the
alt-tabbing code:

-the code to detect how many lines we need looks bogus (you always get
three)

-alt-tabbing when everything is hidden always reawakes the most recent
window.

Fixes for these will be forthcoming.

ok simon@.

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